Sounds like the same fucking voice right there in that video. Probably just a publicity stunt.

I think so too.
No matter what you think of them, I think they're doing a great job with all the gimmicks and stunts. It obviously works, and good for them.
I still don't know who the fuck they are, although I didn't go out of my way to research it.

Repugnant vocalist is 100% the vocalist; it's common knowledge really and the Soulseller guy confirmed it a year or so back. Likely that Subvision members are also present, though I'm just guessing there.